A sealing tape is provided for sealing connecting joints between a window frame and a window embrasure in a building. The sealing tape is for adhering to the window frame and the window embrasure. The tape has an elastically moldable membrane base material; and a nonwoven layer of adhesion material covering at least one surface of the base material and which is elastically expandable in a lateral direction of the sealing tape for absorbing movements between the window frame and the window embrasure and which is substantially non-expandable in a longitudinal direction of the sealing tape so as to provide a sufficiently high yield strength of the sealing tape during use. The nonwoven layer is such that stucco or plaster can adhere to it.